Grinding-mill.



PATENTED JULY 21, 1908.. J. BARR & W. J. MONTZ.

GRINDING MILL.

APPLICATION FILED DEG.14, 1907.

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UNITED. STATES PATENT OFFICE.

JOSEPH BA ltlt, Oi" ALLENTOWN, AND WILLIAM J. MONTZ, OF OltMRO I), PENNS YLVANIA.

GRINDING-MILL.

Specification of Letters Patent.

Patented July 21, 1908.

Application tiled December 14, 1907. Serial No. 406,459.

. T all whom it may com-cm:

Be it known that we, JOSEPH BARR, of- Allentown, and WILLIAM J. l\'I(,)N'lZ, of ()rmrod, in the county of liehigh and State of Pennsylvania, citizens of the United States, have made certain new and useful Inventions Relating to Grinding-ltlills, of which the following is a specification, taken in connection with the accompanying drawing, which forms part of the same.

This invention relates to grinding mills, and relates especially to the-trunnion construction of centrifugal Griffin mills.

.In the accom anving drawings showing an illustrative em )odhnent of this invention, and in which the same reference numeral refers to similar parts in the several figures, Figure 1 is a vertical central section through a grinding mill. Fig. 2 is a detail transverse section of the trunnion and adjacent pulley construction; and Fig. 3 is a perspective view of the trunnion member.

In the illustrative embodiment of this invention shown in the drawings, the grinding mill comprises the heav base 1 formed with the grinding pan 2 an( carrying the heavy frame 3. The ring die 5 ma be firmly secured in position by the wet ging action of the adjacent art of the casing 6 which as indicatcd may escrewed down upon it. This casing may be provided with the feed chute 7 and the upwardly extending casing cone 8. The 11 per part of the frame which may be f ()l'llK't in two parts bolted together by the heav bolts 26, may carry the bushing 18 in whic rthe collar 19 1S adjustably mounted, as by the indicated screw connection between the parts. The sleeve 12 may, if desired, be provided with the sleeve flange 11 having a threaded connection with the collar and firmly secured in adjusted position thereon by the stay bolts 20 so as to rigidly sup ort this bearing sleeve from the frame. he pulley 16 may be formed with an integral hub 30 having a conical inner face to cooperate with the sleeve and adapted to rest at its lower end on the bearing rings 35. This pulley as indicated may be formed with the rim 15 and the head 23 inclosing the trunnion member and being held in almcment by the stud 25 which has a bearing therein and which is rigidly supported by theyoke 24 secured to the frame.

The roll 4 cooperating with the die 5 may be ri idly secured upon the roll-shaft 9 provided with the fans 10. The roll-shaft may be rigidly secured to the trunnion member by having a conical portion passing through the same and engaged by the bolt 21 so that the roll is properly supported within the die. As indicated, the trunnion ball 13 may rest upon the socket 36 and be properly maintained in cooperation therewith by a pressure ring 38 resting upon the ball and 'yicldingly pressed against the same by the pressure spring 22, although it is, of-course, understood that the grinding mill to which this particular trunnion construction is ap lied ncednot be formed exactly as describei The trunnion member may be formed with the reduced necks 32 projecting laterally outward on op )osite sides of the ball and carrying the en arged heads 14 for engagement with the driving faces of the pulley. As indicated in Fig. 3, the heads may have a substantiall uniform cross-section and be eccentrica ly located with respect to the axis of the necks so as to have their projecting driving faces 28 on opposite sides of this axis. These heads are preferably formed with a somewhat flattened curved driving face 28 to cooperate with the steel spline 17 forming the cooperating driving face of the pulley. The other art of the head is prefera ly eccentric with t e neck and substantially tangent to the surface thereof on the side opposite the driving face of the head. In this way the head is provided with ample bearing surface and.

can readily slide vertically up and down the driving face of the pulley as well as turn against it, both these motions taking place in the operation of the mill. By formlng the head 14 of the trunnion member eccentric with respect to the neck 32, a large amount of wear can take place without requiring the renewal of the trunnion member and thewear can be readily taken up from time to time by insertin a thicker spline 17 so as to bring the driving ace of the pulley sufficiently close to the opposing wall 37 of the driving slot in the pulle As the pulley slot may be sufficient y filled with oil so that the trunnion heads run in ractically an oil bath the wear is quite smali and furthermore, as has been demonstrated, these inte ral heads give a much more reliable and efinite driving action and are less subject to breakage than where separate loose arts are employed.

Having described t 1is invention in connection with an illustrative embodiment thereof, to the details of'which disclosure the invention is not, of course, to be limited, what is claimed as new and what is desired to be secured by Letters Patent is set forth in the appended claims. v

1. In grinding mills, a ulley having a bearing socket and driving aces, a roll-shaft and connected trunnion member provided with a spherical portion to cooperate with said bearing socket, said trunnion member having reduced necks extending laterally outward from said spherical portion in opposite directions and enlarged integral eccentric heads on said necks, said heads being of substantially uniform cross-section and having curved flattened driving faces on the sides away from the axis of said necks to engage the driving faces of said pulley.

2. In grinding mills, a ulley having a bearing socket and driving aces, a roll shaft and, connected trunnion member provided with a bearing portion to cooperate with said bearin socket, said trunnion member having nee s extending laterally outward I from said bearing portion in opposite directions and integral eccentric heads on said necks and havlng curved flattened driving faces on the sides away from the axis of said necks to engage the driving faces of said pulley.

In, grinding mills, a pulley rovided with driving faces, a trunnion mem er to be secured to a roll shaft andhaving a bearin ortion, a bearing socket with which sai )earing ortionvcoo crates, said trunnion member eingprovu ed with necks having tending laterally outward therefrom in opposlte directlons, said heads having curved driving faces to engage the driving faces of heads rigid with said bearing portion and ex-- 

